Arca-Swiss Monoball Z1 DP Ball Head. This newly designed ball head features an incredible 130 lb load capacity, an indexed friction control knob with integral tension adjustment thumbdial and an indexed 360 degree panning base with panning lock. The second panning mechanism below the camera mount provided by the DP (Double Pan) model can keep the camera perfectly vertical to the swinging plane, making this ball head ideal for panoramic stitching. The unique elliptical ball design automatically counteracts gravity by progressively increasing tension when tilted further away from the horizontal position. Comes with 5 year warranty.